Freescale Semiconductor, Inc.
A FLASH MCU SOLUTION
68HC908GT16/GT8
8-bit Microcontroller
FEATURES
BENEFITS
TARGET APPLICATIONS
HIGH-PERFORMANCE 68HC08 CPU CORE
• Radar detectors
• Industrial and home lighting
• Security systems
• Home appliances
• Sensors
• Electronic power meters
• Wireless communication
• PDA attachments
• 8 MHz bus operation at 5V operation for
125 nsec minimum instruction cycle time
• 4 MHz bus operation at 3V for 250 nsec
minimum instruction cycle time
• Efficient instruction set including multiply
and divide
• 16 flexible addressing modes including
stack relative with 16-bit stack pointer
• Object code compatible with the 68HC05
• Easy to learn and use architecture
• C optimized architecture provides compact
code
• Fully static low-voltage, low-power design
with wait and stop modes
INTEGRATED SECOND GENERATION FLASH MEMORY
• In-application re-programmable
• Extremely fast programming, encoding 64
bytes in as fast as 2 msec
• FLASH programming across the 68HC08’s
full operating supply voltage with no extra
programming voltage
• 10K write/erase cycles minimum over
temperature
• Cost-effective programming changes and
field software upgrades via in-application
programmability and re-programmability
• Reduces production programming costs
through ultra-fast programming
• Allows re-programmable battery-powered
applications
• Byte-writable for data as well as program
memory
• Protects code from unauthorized reading
and to guard against unintentional
erasing/writing of user-programmable
segments of code
The 68HC908GT16 and 68HC908GT8 are fully
integrated microcontrollers created to make
system design easier by eliminating external
peripherals wherever possible. The internal
clock generator eliminates the need for an
external clock source and helps reduce
system costs. The integrated second
generation FLASH memory programs up to
100 times faster than prior FLASH solutions
and offers in-application programming.
Features include a synchronous serial
peripheral interface (SPI), an asynchronous
serial communications interface (SCI), an
analog-to-digital converter (ADC), an auto
wakeup from stop feature, low-voltage inhibit
(LVI) and a watchdog timer.
• Flexible block protection and security
UP TO 33 BI-DIRECTIONAL INPUT/OUTPUT (I/O) LINES
• 10 mA sink/source on all I/O pins
• 15 mA sink capability on five I/O pins
• Keyboard scan with selectable interrupts
on eight I/O pins
• Software programmable pullups on 23
I/O pins
• High-current I/O allows direct drive of LED
and other circuits to eliminate external
drivers and reduce system costs
• Keyboard scan with programmable pullups
eliminates external glue logic when
interfacing to simple keypads
KBI
HC08 CPU
TWO PROGRAMMABLE 16-BIT TIMER CHANNELS
• 125 nsec resolution at 8 MHz bus
• Free-running counter or modulo up-counter
• Each channel independently programmable
for input capture, output compare or
unbuffered PWM
8-ch 8-bit
ADC
16K/8K Flash
• Pairing timer channels provides a buffered
PWM function
SCI
SPI
512 RAM
LVI
INTERNAL CLOCK GENERATOR
• Software-selectable bus frequencies
• 2% accurate with trim capability
• Clock monitor
• Option to allow use of external clock source
or external crystal/ceramic resonator
• Eliminates the need and cost for an
external clock source
• Improved accuracy across temperature and
voltage
2 x 2-ch
16-bit Timer
COP
Internal
Clock
TIMEBASE MODULE
Up to 36 GPIO
Generator
• 8 user-selectable periodic real-time
interrupts
• Optionally operate in low-power stop mode
• Provides auto wakeup from low-power stop
mode to maintain real-time clock or check
external device status such as sensors
For More Information On This Product,
Go to: www.freescale.com
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